<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	 <%    
             if(session.getAttribute("currentUser") == null) {      
   %>    
          <script type="text/javascript" language="javascript">
            alert("登录已失效，请重新登录");   
           top.location.href="<%=request.getContextPath()%>/login.jsp";  
           </script>   
   <% 
             }
   %>   
</body>
</html>